Method of manufacturing grip-nuts.



' zen of the United States V .residing at New Glasgow', in the Province of Novah Scotia,

- STATES i PATENT y orrron.

FREDERIC WILLIAM wnrorrri AND CHARLES RICHARD Boor, or NnWf-emsoow. yNovn SCOTIA, CANADA METHOD 0F MANUFACTURING GRIP-NUTS.

Spelcication. of Iietters Patent.

Patented oet'. 6, 19144..

Application tiled November 219:, 191.8. l Serial No. 802,820.

To ill whom it may Concern it known that we, liosnnnm WILLIAM WRIGHT, a subject of King of Great Britain, and CHARLES RiciIARnItooF, a citiof America, both in theDolninion of Canada, have invented certain new and useful Improvements in Methods of Manufacturing Grip-Nuts, of which the'following is the speeiiication.

This Invention relates to improvements in methods of manufacturing grip nuts andthe objects fof the inventionare to reduce the cost of manufacture and to enable the greater part of the formation of the nut to be performed by a pressing or rollin operation, and it consists essentially 'of t e irn-- proved construction hereinafter described in detail in the .accompanying specification and' drawing.:

In the drawing, Figure l is a pers ective view of the rolled bar from which t e nut may be made. Fig. 2 is a perspective view oi' the nut itself. Fig. through the nut.-

In the drawings like characters of refei-, ence' indicate corresponding partsin all the figures.

Our invention relates to that. type of grip nut in which the outer partof the nut is formed with recesses, the sides of the outer portion ot the nut being bent toward each other to torni a secure grip on the threads of the bolt. l

In accordance 'with the present 4invention therecess is either rolled in the bar from which the nuts are made, or iis p ressed i'nto the nut while hot.. l

Referring to the drawing, A represents the nut of any desirable size which is formed on opposite sides with transverse recesses l0 and Il, these recesses in the smaller nuts, ior instance nuts up' to one-half inch, .being conveniently constructed by forming a suit able groove 19. in the bar B from which the nuts are cut and punched. It will also be oli-- served that the formation ot' this recess ref duces the amount of material which requires;` to he punched-and so' enables nuts up to onehalt' inch in size to be punched and cut ofi cold.

3 is a cross sectionV The shape of the 'groove 12; and consequently of the recesses 10 andll, is such as to provide lleted corners 14 and l5 and rounded edges 16 and' 17- ontthe recesses. With the larger nuts, that is nuts over onehalf inch in size, the recesses would be pressed into- -the nuts by the nut machine while they are hot.

The nuts formed described have their upper portions on opposite sides of the recesses pressed toward each other. The eiect of this is seen in Fig. 3 of the drawin whereby it will be seen that the 'diameter o the erforation through the nut 1s narrower at t e top or outerside than at the bottom whereby a secure locking action will be produced when the upper or outer portion ofr the nut is screwed o nto the bolt.`

We are aware that it is well known to cut or'mill a slot in the outer portion of a nut and to press the sides of the nut together over the s1ot,but such ,construction is expensive rom a manufacturing standpoint and the material cut from the recess is wasted.4

According to our invention the recess is pressed in the nut and the sides of the nut pressed toward` each other over the recess, after the nut has been tapped.

It may be noted that the term pressed is employed in the claim to indicate either the operation in which the recess is rolled into the bar from which the nuts are formed, or that in which the recess is pressed into the nut by the nut machine. -In either case the ,walls on opposite sides of the rcess are pressedftoward each other to produceA the secure locking action hereinbefore described. What we claim as our inventionis:

In the art of-rnaking grip nuts, pressing a recess into the upper side of the nut and forming 'illeted corners on suchrecess, and then pressing the sides of the recess toward cach other, whereby the diameter of the perforation through the nut is smaller on one side than on the other.

. In witness whereof we have hereunto set ourhands in the presence of two witnesses. FREDERIC WILLIAM WRIGHT. CHARLES RICHARD ROOF. Witnesses:

JEAN I. Raro, Snom M. Primas.

with' the recesses as above 

